sunburst vs sunshine

sunburst and sunshine both are nouns.

Word	Noun	Adjective	Verb	Adverb
sunburst	Yes	No	No	No
sunshine	Yes	No	No	No

As nouns, sunshine is a hypernym of sunburst; that is, sunshine is a word with a broader meaning than sunburst:

Other hypernyms of sunburst include sun, sunlight.

sunburst (noun)	sunshine (noun)
a jeweled brooch with a pattern resembling the sun	the quality of being cheerful and dispelling gloom
a design consisting of a central disk resembling the sun and rays emanating from it	the rays of the sun
a sudden emergence of the sun from behind clouds	moderate weather; suitable for outdoor activities